I have a 2002 Highlander that I bought new which now has 80,554 miles. Several weeks ago, the CEL came on. I took it to Autozone for the analysis which read P0141 and P0161. Apparently these codes correspond to the two oxygen sensors after the catalytic converter. My question is, what are the chances of two sensors going bad or has the converter gone bad (of course I'm past 80K). Anyone out there have any suggestions before buy 2 new sensors and then find out that my converter was what needed to be replaced? HELP!